Sand-blast machine



E. A; RlCH,-JR. SAND BLAST MACHINE. APPLICATION map ARR-2,1916.

Patented May 10,1921.

3 SHEETS-SHEET 1.

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SAND BLAST MACHINE.

' Patented May 10,1921.

APPLICATION FILED APR-7 1,377,993.

3 SHEETS-SHEET 2- Patented my 10, 1921,

3 SHEETS-SHEET 3.

- TED OFF-ICE,

n'mvrnn a. RICH, JR, QF'cHICAGQl OIS, ASSiGNOR Tommmmmim bm I EQUIPMENT COMPANY, or new roan, N. Y., A conronarron or 01110.5:

g SAND-BLAST MACHINE. i

. Vly invention relates to sand blast machines by which a blast of sand may be directed against articles, such for ex ample.as castings, so as to clean or otherwlse treat the same. I

' Prominent objectsof the invention are to provid a simple, practical and effective sand blast machine; to arrange for the easy and ready introduction-of the articles to be treated into the machine, also the ready, quick and convenient removal of said articles from the .same; :to arrange for the economical use of thesand by automatically returning the same after use into position to be used again;to arrange for the effective treatment of the articles within the machine .so'that such treatment will be efiicient and even over all portions of the articles and to accomplish the foregoing and other desirable I results in a simple and expeditious manner. In the accompanying drawings Figure 1 is a front View of-a sand blast machine embodying my present invention; Fig. 2-is a side elevation of the same Figs- 3, l, 5, and Gare views of details of construction.

In the'drawings I show a machine em bodying a framework having front side. uprights 1-1 "and rear side uprights 2-2. Mounted more orless centrally in the frame is a rotary drum 3 which is to receive the articles'tobe acted-upon and also to recelve asand blast which shall act upon said articleswhen they are insaid drum; The drum 3 as best shown in Fig. 3, is arranged to rotate about two stationary heads 4. -4, one ateach end (onej only being shown in Fig. 3;) which he'adsjl are mounted stationarily upon or in the machine so that .theyfit within the ends 5-5. of said drum 3, thereby permitting the-, dru m to rotate about said heads. 'The heads a are preferably in the form Of-flttt disk-like metalliemembers pro- .vided ,with laterally --exten1ding "arms (or Applicationfiled April 7, 1916. Serial in. 89,532.

Specification of Letters Patent. May 10 bracketsfi and 7 which 'latterextend lengthwise ofbracket members. 8-8 and are bolted to :the same by bolts -9-9,'the members-:3

being in turn bolted to horizontally arshown in Fig. 2. Theends 5-5 of-the roranged forwardlyand rearwardly extending tary drum .3 are-preferably provided with wear plates 1l,each of which conveniently consists of a ring fitted within a circularaperture 1n the end 5 and having 'anout- .wardly extending annular web portion 12 adapted to fit within the innerledge portion of the end 5 immediately surrounding said central aperture therein. Bolts l secure the ring 11 to the end'5. Thus theseringsxll fit over the stationary heads 4: and turnonithe same so as to permit thegdrum' 3 to have .the

desired rotary motionfrelative tQ-said' heads.

The wear. plates maybe changed without 3 are made as best shown in Figs. 1 and 3,-

7 5 changing thedrum Theendsoof the drum that-is, said ends are made witht'inclined;

' surfaces 15 and 16 (Fig. 3) whereof the surfaces 15 project 'orincline' outwardly from the axial or head portion of;the drum and the surfaces 16 extend and incline inwardly from said head portion. Thesurfaces 15am, situated diagonally across from oneanother on the drum, and the surfaces 16 are also diagonally opposed to one another. 'In this way the'ends of the drum in. effect .form sloping surfaces substantially parallel withone another at the ends ofthedrum, and these surfaces have theeffect ofmoving or throw ing the articles, such as castings, located within the drum, back and forth so, as ,to 6X- a way as to insure proper and even treatment When'asthe drum ,rotates, the castings are in the upper part ofthe barrel ,or

drum,- they will of course fall'to the-bottom,

throw said'castings or other articles to the right, andsoturnthem over and over exposing them on all sides to the sand blast.

'pose them properly to the air blast .insllch When the drum has revolved 180 degrees from the position shown inFig, 1, the castingsflor other articles willrbe thrown tothe left because'of the inclination ofthe right hand side or end of thcfdru'm. In thisway I there is a continual-shifting back and forth of the castings or other articles and a consequent effective treatment by the air blast. The drum is made with perforations 18 in its cylindric wall by which the sand can escape;

The'sand blast is directed into the drum 3 by means of nozzles 20 (Figs. 1, 3 and 4). These nozzles pass through the stationary heads so that they continually direct the sand blast into the interior of the drum as the latter is rotated. The nozzles 20 are connected with tubular members 21 having longitudinally extending air passages 22 and. parallel ducts or passages 23 for the sand. The nozzles 20 are secured to the end of the members 21 by means of couplings 24 secured to the members 21 by screws '25 and having mixing chambers 26 and small apertures 27 through which the air passes at high pressure. a Each member 21 isarranged at an inclination preferably about 45 degrees to the vertical, so that the sand blast is directed at that angle into the drum 3 at each side thereof. Sand boxes 28 are mounted on opposite sides of the machine and provided with apertures 29, into which sand .may pass into the sand ducts 23. Valves 30 control the apertures 29" and are in turn controlled by levers or handles 31, Figs. 4 and 5. Each lever 31 is pivoted at 32 so that by swinging the handle"31 the valve portion 30 opens and closes the outlet aperthen passing out the oppositeends of the sameeinto the pipes 33 and thence into the air blast nozzles.

Sand is supplied to the sand boxes 28 in a continuous manner from the discharge from the rotary drum 3, there being a continuous circulation'of said air kept up into the drum 3 by the sand blast nozzles from theboxes 28 and then into the drum again and so on continually. This is brought about by an endless conveyer 40 havlng buckets 41, said conveyer traveling over pulleys 42 and 43 at thebottom of the machine and 44 at the top of the same. The buckets 41 in passing in the direction indicated by the arrow in Fig. 1 from the pulley 42 to the pulley 43 gather up the sand which is on the floor of the machine and elevate it until the pulley 44 at the top of the machine 'is reached, in going around which the buckets 41 empty the sand which they are carrying. The sand which the buckets 41 gather from the floor-ofthe device is deposited there by means of a platform formcated in an aperture in the top 50 of a sand box 51 (Fig. 6). Within this box 51 there are two downwardly and forwardly inclined slides 52 which extend outwardly from" under the screen 49 to the side edges of the machine and terminate in extensions 53 on the tops of the sandboxes 28, whereby sand discharged from the buckets 41 and into the hopper 47 passes through the screen 49 and I on to the slides 52 and thence downwardly upon the latter into the sand boxes 28. From these latter it is discharged through the nozzles 20 into the drum 3 as previously described. The upper pulley 41 is driven so as to drive thesand conveyer by means of a shaft 54, gear connected with a a main driving-shaft 55 carrying a pulley 56 and a friction clutch 57 operated by a hand lever 58.

The rotary drum 3 is preferably driven by driving mechanism consisting of driving rolls 59 located underneath the drum 3' and having driving surfaces in contact with annulardriven rims 60 formed or provided at the opposite sides of saiddrum. The driving rolls 59 are mounted upon a shaft 61 which is driven by a sprocket chain 62 in turn driven by a sprocket wheel 63 on the driving shaft 55.

The drum 3' is provided with a door 65 which may be held in position by means of straps 66 whose ends are engaged by cleats 68 and whose opposite ends pass over projections 69 having pins 70 whereby the door may be opened by disengaging it from the projections 69 by removing the pins 70 and also disengaging the straps 66 from the cleats 68. This permits castings or other articles to be treated to be inserted into the interior of the drum.

As an arrangement for conveniently handling the door 65 I provide mechanism by which said door may be mechanically engaged and lifted and held in suspense in an elevated position, while castings are inserted into or removed from the barrel, after which the door may be lowered back to its closed position. I This 'mechanism comprises a swinging frame conveniently constructed of a straight upper bar 86;(Fig. 1), and a-lower inclined bar 87, both pivoted to one of the side upright members 1 as at 88 an'd'89," respectively, said bars being connected to- 'gether at their outer or swinging ends so that together they form a swingingv frame which maybe swung to one side or the other of the upright'2 to which it is pivoted. In Fig. 1 I show said frame in solid lines swung to the left and in dotted lines swungtothe right. In the left hand or solid line position, the swinging or free end of the frame is infront of the central or middle part of the door 65, as shown in Fig. 1. Said swinging frame carries a lever 90 which is pivotally mounted on the freeend of the frame, being pivoted thereto by a pivot 91 (Fig. 2). One end of said lever 90 is short and has a hook 92, whereas the other endis long and adapted'to be grasped by the hand. Thus when the frame with the lever 90 is swung to a position in front of the door 65, as shown in Fig. 1, the long or outer end of 'the'handle maybe swung down so as to lift the short vend, the door 65 being provided with a lug or eyelet 93 which will be engaged by the hook or end 92 so that when the lever is operated in this way the door 65 will bera'ised. In order to hold the door'in an elevated position a pin 94 may be inserted into one of a series of holes 95 so that the long end of the lever 90 may be pushed down below said pin and the latter will hold the lever depressed and the door elevated. The holes,

95 are provided infltwo side members 96 which are secured to the free" end of the swinging frame and arranged crosswise of said end, as shown in Figs. 1 and 2. By such arrangement the door may be elevated and lowered as desired to permit the insertion and removal of castings without having to When the adjustment of the door is completed the swinging frame may be swung away from in front of the door and drum and off to one side, as shown by dotted lines inFig. 1.

In order to remove said articles when through their treatment the door 65 is opened and then the drum'turned so that the opening where the door fitted is underneath. This allows the articles to fall out. In order to catch them as they drop, a truck (not drum. To permit the truck to be placed in this space the platform 45 is made so that it can be lowered not only to get it out of such space but also so that it will form a floor for the truck. A convenient arrangement is to have said platform pivoted at 72 so that it may be swung down to a horizontal position. A counterweight 7 3 for balancing the platform 45 is mounted on a rod or lever 74 secured to the pivotal shaft 72 on the opposite side to the platform 45. Fur-thermore, a swinging door 7 5 is mounted on hinges 7 6 so that it may normally be in position to close the space above the platform 45 when the latter is in its inclined position as shown in Fig. 2. In this position said door provided by which access can beahad to the vdrum. Thistdoor is carried by a cable 81 extending'upwardly around a pulley '82 and thence over a pulley ,83 and downwardly, and

provided at its ends-with a counterweight 84.

Itwill be understood that changes and modifications may be made without departing from thespirit of the invention.

VVha-t I claim is:

1. The combination of a rotary drum provided with apertures for the escape of sand,

' a frame supporting "said drum, and an. in-

clined platform located below said drum and arranged to convey sanddownwardly from said drum, said platform being hinged near thevfloor so that when swungrdown into a horizontal position it will form a, support foratruck. v. i l

. 2. The combination'of arotary drum provided with apertures for the: escape of sand, a frame'supporting said drum, and an inclined platform located below said drum and arranged to convey sand downwardly fromsaid drum, said platform beinghin ged near the floor so that when swung down into a horizontal position it will form a support for a truck, and a counterweight and arms for counterbalancing said platform.

3. The combination of a rotary drum provided with apertures for the escape of sand, a frame. supporting said drum, and an inclined platform located below: said drum and arranged to convey sand downwardly'from said drum,sa1d platform bemg hinged so as to permit 1t to be swung down lnto a horizontal position to form a "support for i a truck, a counterweight and arms forfcounter-balancing said platform, and swinging doors arranged to close the space above said inclined platform.

4. The combinationof a rotary drum provided with apertures for the escape of sand, said drum having ends which are inclined to the axis ofithe drum except at their central portions which are perpendicular to said axis and are provided with central openings, and a pair of heads arranged axially of the drum at the opposite ends of the same, said heads having platelike members which close said apertures and also serve as bearings for the drum, and sand discharge nozzles extending through said platelike members and arranged to discharge sand into the is locked by a locking device 7 Wheinhow- I interior of said drum, the endsof said drum to the lower endof said inclined member, said'inclined member being hinged at one edge to the frame near the bottom of the same, whereby said member may be swung from its inclined position downwardly to a horizontal position at or near the-bottom of said frame. 1 r

6. The combination with the rotary drum provided with apertures for the escape of sand, of sand blast nozzles at the opposite ends of said drum, a single traveling conveyer, means for conveying the sand from said drum to said conveyer and means for distributing the sand from said conveyer to the nozzles at the opposite ends of the drum.

7. The combination with the rotary drum provided" with apertures for the escape of sand, of sand blast nozzles at the opposlte ends of said drum a single traveling conveyer, means for conveying the sand from said drum to said conveyer and means for distributing the sand from said conveyer to the nozzles at the opposite ends of the drum,

said last mentioned means comprising a pair, of chutes, one extending to the nozzle at one end of the drum and the other extending to the nozzle at the other end of the drum.

8. The combination with the rotary drum provided with apertures for the escape of sand, of sand blast nozzles at the opposite ends of said drum, a single traveling conveyer, means for conveying the sand from said drum to said conveyer and means for distributing the sand from said conveyer to the nozzles at the opposite ends of the drum, said last mentioned means comprising a pair of chutes, one extending to the nozzle at one end of the drum and the other extending to the nozzle at the other end of the drum, said chuteshaving their upper ends adjacent one anotherand a single sand discharge member arranged to recelve sand from said traveling conveyer and discharge the same upon the upper ends of said chutes. e

9. The combination of a rotary horizontally disposed apertured drum, a single inclined member locatedbelow said drum for receiving and conveying all of the sand therefrom to-one side of the machine, a vertioally arranged endless conveyer having its lower portion located at thelower end of said inclined member, an outlet forsand at the upper end of said traveling conveyer,

sand discharge nozzles at the opposite ends of said drum and means for receiving sand from sald outlet and dlstributmgthe same to said nozzles.

10. The combination of a rotary horizontally disposed apertured drum, a single in- V clined member located below said drum for receiving and conveying all of the sand therefrom to one side of the machine, a vertically arranged endless conveyer having its lower portion located at thelower end-of said inclined member, an outlet for sand at the upper end of said traveling conveyer, said discharge nozzles at the opposite ends of said drum and means for receiving sand from said outlet and distributing the same to said nozzles, said last mentioned means including a box51 containing two chutes 52 having their upper ends united and their lower ends separated and extending to the opposite sides of the frameto points above;

the sand nozzles and a screen 49 located below the discharge member for discharging sand from the traveling conveyer.

In witness whereof, I hereunto subscribe my name this 21st day of March, A. D.,

ELMER A. RICH, JR.

Witness: 7

A. LYDA J ONES. 

